Radiodial



.im 19, 192s. H MATZNER I 1,674,603

RADIODIAL Filed July so, 1927 y ATTORNEY rama Jur-. ie, 192s.`

,UNITED STATES tamos PATENT `foFFlcr-z'.

HYMAN MATZNER, OF NEW YORK, N. Y.

RADIQDIAL.

Application filed July 30. 1927. Serial No. 209,517.

The present invention is concerned with improvements in radio dials, an object of the invention being to provide a dial "audible one I prefer to use a visible indiylo cator such as the lamp which illuminates a Window on the face of the dial at times when the dial has been set to bring in a station.y If the lamp lights and the station is mandi ble, it is an indication that that particular station is not broadcasting at the moment. Additional indicating means is preferably provided in the nature of visible station call letters which are exposed at the same time thatL the lamp is lit, so that the operator ofk .the dial Will know justwhich station he is getting without. Waiting for any announcement of the station call letters.

Another object of 'the invention is to provide a radio dial having an improvedmeans for manipulating it;\specically to provide a driving or rotating means for the dial which will permit minute dialadjustments, and at the same time prevent the play and back-lash which is one of the recognized disadvantages of present gear-driven dials.

Other objects of the invention are to proi vide a dial of simple, practical construction,

the dial removed.

I Fig. 3 1s a transverse lsectional view on In the drawings I have used the reference which'will be neat-and attractive in appearv ance, rugged, .durable and eilicient in use, and well suited to the requirementsof economical manufacture and convenient manipulation. With the above noted and other `objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be-more fully understood fromthe following description in connection with the drawings, wherein- Fig. 1 is a front elevational view of adial embodying the invention. l

Fig. 2 is a similar ,view with the cover of the line 3-3 of Fig. 2.

numeral 10 to designate the panel ,board of a radio receiving set, and the vreference nu-`lz meral 11 to indicate a circular dial casing fixed to the panel'board as by a screw 12 and provided with a cover 13. A shaft 14 accompanying 20 displays. station call letters such at 32, and

` HEISSUED controlling the radio set is journalled in the panel and the bottom of the casing 11, and carries `a .hub 15 disposed Within the dial casing.

Spider arms 16 projecting radially from the hub carry an annular member 17. One

. section of this member, preferably a semicircular section thereofA is provided with a spiral thread 18, and the other section carries a semi-circular conductive plate 19 upon which is mountedv a similarly shaped strip of paper or the like 20.

The dial casing 11 and cover 13 are cutV away as at 21 to accommodate a nut 22 havying inwardly projecting pins 23 meshing with the spiral thread 18. The'nut 22 being limited 4against lateral movement by the walls of the dial casing and cover acts when rotated to transmit movement to the'screw 18 androtate the ring 17, hub 1.5,and shaft 14. This screw or worm motion is of course very slowso that extremely fine adjustments of the dial maybe had. The-screw must also prevent any back-lash such as is present in the ordinary' type of gear driven dials.

The cover 13 is provided with a window 10a arranged above a signal lamp 24 mounted in a block 25 integral with the base of the dial housing 1'1.-

One side of this lamp is connected by a spring contact 26 to the brass plate 19, and

the other side of the lamp is connected through a wire 27 directl to a source of curf rent (not shown) throu a binding post 28.

A return lead from t e battery or other the`inner face of the casing 11 immediately adjacent an indicating opening 31 arranged in the casing cover.

Preferably, the inner-portion of the strip the outer portion of the strip 2O is provided with a plurality of closel arranged aperf tures 33 into any of whic contact pins 34 are adapted tobe dropped; these pins mak-t One vof the contact pins is o coursearl ing electrical contact with the late 19.

ranged adjacent each station call` letter, the call letters being Written and the pins emplaced by the dial operator after a thorough test of the exact dial positions in which the various stations are received.

t AS the dial is rotated by turning the nut .l 22, the heads of the contact pins 34 will come into contact with the finger 30pclosing a circuit through the lamp`34 and illuminating the Windowl 10a. This illumination will be suiciently bright to render the call letters which are ex sed through the opening 31 in the bottom o the depression 31 in the cover Jl'lreadily discernible. The strip 20 upon set in proper position for receiving a station.

-By observing the call vletters throughv the window 31 he can tell just which station he should be receiving, and if no signals are vheard he Will `note that the station is not broadcastin at that particular moment.

Various c anges and alterations might be made in the general form and arrangement of theparts described without departing from the invention. lHence I do not wish to limit In self to the details set forth, but shall consi er myself at liberty to make such changes and alterations as fairly fall Within l claim: 1. A dial for radio receiving sets inclding a single electrical indicator adapted to be the spirit and scope of the appended claims.

lrendered active only when the dial is set to ltune in a station, a normally open circuit in which' said indicator is arranged, and a plurality of circuit closing means carriedby the dial.

2. A dial for radio receiving sets including housing, signal a an electrical indicatorv adaptedtobe renderedl active only when the' dial is set to tune in a station, a normally open circuit in which said indicator is arran ed, and circuit closing means carried by t e dial, said circuit closing means including a plurality of contact members carried lby the dial and disposed in circuit closing position only When the dial is set to tune'in a station.

3. A radio dial including a stationary a dial rotatable in the housing, a m in the housing` arranged under a Window t erein, a normally open lamp con trolling circuit, and circuit closing means rcarried by the dial.

4. A radio dial including a stationary housing, a dial rotatable in the housing, a signal lamp in the housing arranged under a window therein,`a normally open lamp controlling circuit, and circuit closing means lcarried by the dial-comprising contact pins lselectively positioned on the dial in accord- .ance with the dial settings necessary to tune in broadcasting stationsff 5. A radio dial including a stationary housing, a dial rotatable inthe housing, a si al lamp in the housing arranged under a Wlndow therein, a normally open lamp con- -trolling circuit, and circuit closing means carried by the dial2 and Visible station indicating means carried, b the dial, exposed through the casing an illumined by the lamps.

ySigned at New York in the county of New York and State of New York this 29th day of July, A. D. 1927.

. HYMAN MATZNER. 

